JP2001073675A - Pneumatic device for tunneling machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To allow cutters to be replaced at a desired position, reduce equipment of compressing air, and shorten air compressing time. SOLUTION: A pressure partition wall 30 is installed at the front of an existing segment 22, and the pressure partition 30 is pressed by a shield jack 19. A door and a pneumatic tube are provided on the pressure partition wall 30. After a worker 40 enters a machine through the door of the pressure partition wall 30, compressed air is fed through the pneumatic tube 36 to raise a pressure inside the machine to a specified pressure. Next, a pneumatic tube 38 at a partition wall 6 of a cutter chamber 10 is opened to act the compressed air onto the inside of the cutter chamber in order to seal underground water from a heading. Then, a door 37 of the partition wall 6 is opened, and the worker 40 enters the cutter chamber 10 and replaces a cutter 3.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a pneumatic device for a tunnel machine which can easily replace cutters attached to the front of a cutter head.

[0002]

2. Description of the Related Art Many cutters are mounted on a cutter head of a tunnel machine called a shield machine.
When these cutters are worn, phenomena such as a reduction in propulsion speed and an increase in cutter torque occur, so that it is necessary to replace the cutters. Conventionally, the exchange of cutters of a tunnel machine involves attaching a pressure bulkhead to the rear segment of the trailing bogie of the tunnel machine, applying pressure to the front through this bulkhead, applying pressure to the face, stabilizing the face, and stopping water. And then
This was performed by an operator entering the cutter head chamber for taking in earth and sand.

[0003]

In such a conventional example, when air is to be actuated, it is necessary to assemble a segment for attaching a pressure bulkhead in advance, and attach the pressure bulkhead to the segment for attaching a pressure bulkhead. However, the partition wall could not be installed at a desired position.
Therefore, when the cutters are worn, there is a problem that the cutters cannot be replaced at a desired position. In addition, there is also a problem that the volume of the pressurized air increases from the partition wall to the tip of the entire tunnel machine including the entire tunnel machine, and the pneumatic pump equipment for increasing the pressure to a specified pressure becomes large.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned drawbacks, and an object of the present invention is to make it possible to replace cutters at a desired position and to reduce equipment for air pressure. It is an object of the present invention to provide a pneumatic device for a tunnel machine that is capable of shortening the pneumatic time while being capable of shortening.

[0005]

Means and Effects for Solving the Problems Claim 1
The pneumatic device of the tunnel machine includes a pneumatic partition wall 30 detachably provided on the front side of the existing segment 22, a pneumatic tube 36 for supplying pneumatic pressure from the pneumatic partition wall 30 to the inside of the machine in front, and the pneumatic partition wall. 30, a communication hole provided in the partition wall 6 of the cutter chamber 10, and a door 37 for entering and exiting the cutter chamber 10.
And is characterized by having.

In the tunnel machine of the first aspect,
When the wear of the cutter 3 progresses and a phenomenon such as a decrease in the propulsion speed or an increase in the cutter torque occurs and it is necessary to replace the cutters, the compressed air partition 30 is disposed in front of the existing segment 22. Then, compressed air is supplied into the machine from the compressed air pipe 36 of the compressed air partition 30 to raise the inside of the machine to a specified pressure. Further, the pressurized air is applied to the inside of the cutter chamber 10 through the communication hole of the partition 6 of the cutter chamber 10 to stop the underground water of the face. Then, in this state, the worker 40 enters the cutter chamber 10 and replaces the cutter 3 of the cutter head 4.
Thus, unlike the conventional case, it is not necessary to provide a special segment for attaching the partition wall, and thus, it is possible to exchange a cutter or the like at a desired position. Further, since the compressed air is supplied only forward from the compressed air partition 30 installed in the machine, the equipment for the compressed air can be reduced in size, and the compressed time can be shortened.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, an embodiment of a pneumatic device for a tunnel machine according to the present invention will be described in detail with reference to the drawings. When it is difficult to improve the ground by chemical injection from the ground due to the geology with a lot of groundwater, it is necessary to replace the cutter of the tunnel machine from the inside of the machine.In such a case, pressure is applied to the face to stop the water stoppage. After that, change the cutter. In the present invention, at the time of such cutter exchange, a pressure partition is installed in the tunnel machine to reduce the volume on which the compressed air acts.

First, a first embodiment will be described with reference to FIGS. 1 and 2. Tunnel machine 1 for excavating tunnels
As shown in FIG. 1, the front part is surrounded by a cylindrical shield 2. On the front end side of the shield 2, a cutter head 4 provided with a number of disc-shaped cutters 3 for excavation is rotatably arranged via bearings 5. Shield 2
A partition 6 is arranged in the inside, and the partition 6 has a circular plate shape, and an outer peripheral edge of the partition 6 is fixed to the shield 2. Also, the front of the partition 6 and the cutter head 4
Cutter chamber 1 for taking in earth and sand in the space between
0 is formed. The bearing 5 is attached to the partition 6, and the front side of the motor 7 for driving the cutter head 4 is also fixed to the partition 6. In addition, 11 is earth and sand seal.

A cylindrical screw conveyor 12 is disposed in the tunnel machine 1 in the axial direction, and a front portion of the screw conveyor 12 is located in the cutter chamber 10 through the partition wall 6. Is discharged rearward through the screw conveyor 12. A driving motor 13 is provided at a rear portion of the screw conveyor 12, and a jack 14 for opening and closing a gate is provided at a rear end of the screw conveyor 12.

The shield 2 is divided into two parts in the front-rear direction by a front body 16 and a rear body 17.
7 is connected with a plurality of articulated jacks 18 so that the front trunk 16 can be freely bent with respect to the rear trunk 17 to improve the directional controllability. At a substantially central portion of the shield 2, a plurality of shield jacks 19 for propelling the shield are arranged in the circumferential direction. On the front side of the rear trunk 17, an erector 23 for supporting the segment 22 is provided so as to be movable in the circumferential direction, and the erector 23 is driven in the circumferential direction by a driving motor 24. A tail seal 25 of a wire brush type is provided at the rear end of the rear body 17.

In such a tunnel machine 1, excavation is performed by rotating the cutter head 4 by the motor 7, and after excavation at a predetermined pitch, the shield jack 19 is extended while assembling the segment 22 by the erector 23, and the segment The excavation is performed while moving the shield 2 and rotating the cutter head 4 while obtaining the reaction force.

[0012] When the cutter 3 of the cutter head 4 is worn while rotating while the cutter head 4 is rotating as described above, and a phenomenon such as a reduction in propulsion speed or an increase in cutter torque occurs, the following will be described. As shown in the drawing, the cutter 3 is replaced by installing a pressure partition. That is, as shown in FIG. 1, a disk-shaped pressure bulkhead 30 is installed in the machine. As shown in FIG. 2, the pressure bulkhead 30 is composed of three fan-shaped members 30a, 30b, and 30c. The three members 30a, 30b, and 30c are loaded into the machine and assembled into a disk by welding. I do. The pressure bulkhead 30 and the rear body 17 are sealed with a seal material 31. The O-ring 32 seals the inner peripheral portion of the screw conveyor 12 insertion hole 33 formed at the center of the pressure partition 30 and the outer peripheral surface of the screw conveyor 12.

The installation position of the pressure bulkhead 30 is the position of the front end face of the existing segment 22.
Is installed, and a spreader 39 is provided on the front edge of the pressure bulkhead 30.
Is arranged, and the pressure bulkhead 30 is pressed by the shield jack 19 via the spreader 39.

As shown in FIG. 2, a door 35 for an operator to enter and exit is provided on the pressure bulkhead 30 so as to be openable and closable, and a pressure for applying compressed air from the pressure bulkhead 30 to the inside of the machine is provided. A trachea 36 is provided. A hose from a pressure pump (not shown) is connected to the pressure pipe 36. Further, a door (hatched portion in the figure) 37 for an operator to enter the cutter chamber 10 is also provided on the partition wall 6 for forming the cutter chamber 10 for taking in earth and sand. The partition wall 6 is also provided with a pneumatic tube 38 for applying pneumatic air to the inside of the cutter chamber 10.

When the cutter 3 needs to be replaced as described above, the pressure bulkhead 30 is carried into the machine as described above, the pressure bulkhead 30 is assembled, and seal welding is performed. Then, while the worker 40 is in the machine from the door 35 of the pressure bulkhead 30, the compressed air is sent from the pneumatic tube 36 to raise the inside of the machine to a specified pressure. Next, the pneumatic tube 38 of the partition wall 6 is opened, and pressurized air is applied to the inside of the cutter chamber 10 to stop the groundwater of the face, and the jack 14 for opening and closing the gate is closed.
Thereafter, the worker 40 enters the cutter chamber 10 by opening the door 37 of the partition wall 6, and replaces the cutter 3 after removing the earth and sand in the chamber. Therefore, when it is necessary to replace the cutter 3 during excavation of the tunnel, the cutter can be replaced from the inside of the machine at a desired position at any time. Also, unlike the conventional case, the volume for applying the compressed air is the volume in front of the pressure partition 30, so that the volume is small, so that the compressed air pump equipment for increasing the pressure to the specified pressure can be downsized. The pressure time can be shortened.

When the pressure bulkhead 30 is installed, a part of the swivel ring of the erector 23 is removed and the worker 40 is removed.
And the passage.

FIGS. 3 and 4 show a second embodiment, in which the entire screw conveyor 12 is surrounded by a pressure partition 30 and a cylindrical lock 42 whose rear portion is closed. That is, in this embodiment, as described above,
The pressure bulkhead 30 is divided into three members 30a, 30b, 30
c (see FIG. 4), the pressure partition wall 30 is disposed between the existing segment 22 and the spreader 39 with a sealing material 31 interposed therebetween in the same manner as described above. And
The opening edge of the front end of the lock 42 and the opening edge of the pressure partition 30 are connected via an O-ring 43. Further, a door 35 through which an operator enters and exits and a pneumatic tube 36 are provided on the rear surface of the lock 42. The operation in the case of cutter replacement is the same as that of the previous embodiment, and the description thereof will be omitted. The effects are also the same as those of the previous embodiment.

[Brief description of the drawings]

FIG. 1 is a sectional view of a tunnel machine according to an embodiment of the present invention.

FIG. 2 is a sectional view taken along line AA of FIG. 1 according to the embodiment of the present invention;

FIG. 3 is a sectional view of a tunnel machine according to a second embodiment of the present invention.

FIG. 4 is a diagram of the embodiment of the present invention as viewed from the right side of FIG. 3;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Tunnel machine 2 Shield 4 Cutter head 6 Partition wall 10 Cutter chamber 22 Segment 30 Pressure partition (partition for compressed air) 35 Door 36 Compressed air pipe 38 Door

Claims (1)

[Claims] 1. A compressed air partition (30) detachably provided on the front side of an existing segment (22), and a compressed air pipe (36) for supplying compressed air from the compressed partition (30) to the inside of a machine in front. A door (35) for in-machine access provided in the partition (30) for compressed air, a communication hole provided in the partition (6) of the cutter chamber (10), and a cutter chamber (1).
And a door (37) for entering and exiting the tunnel machine.